I've been getting a lot of questions about GHK Cu, so here's a quick breakdown. GHK Cu is a copper peptide that naturally occurs in the body and plays a role in skin repair Your body made this peptide every day until you turned 30. Then it stopped. GHK Cu (copper peptide) is a naturally occurring tripeptide discovered in 1973. At age 20, your plasma levels sit Delta Sleep Inducing Peptide: Modern Research Frontier GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B Delta Sleep Inducing Peptide DSIP Age Management of West Michigan